Car-door control



March 10, 1931.

E MURPHY CAR DOOR CONTROL Filed Dec. 27, 1928 INVENTOR I ERNEST MURPHYBY @L ATTORN E {47 4'20 trols a door-operating engine.

nets and their. mode of action on the, door Patented Mar. 10, 1931'UNITED STATES PATENT- o Fics ERNEST MURPHY, OI ALBANY, NEW,YORK,ASSIGNOR T0. CONSOLIDATED CAR-HEATING COMPANY, INQ, F ALBANY, NEW YORK,A CORPORATION OF NEW YORK CAR-noon oon'rnor.

Application-tiled December 27,1928. Serial No, 328,820.

,For a detailed description of the present form of my. invention,reference may be had to the following specification and tothe-accompanying drawings forming a part thereof: I I r In thecontrolling of car doors it has heretofore been suggested that the motorwhich operates a car-door, to close or open-it, should be dominated by acounter electromotive 5' force magnet, whereby the opening andclosing ofthe door by the motorman could only occur when the car -was standingstill and the said magnet therefore deenergized. In such arrangements,however, it still remained necessary for the motorman to perform someact that would cause the door to open after thecar. came to a standstillor close before the car restarted. In brief, the said suggestedarrangement did not eliminate the need of action by the motorman to openor close the door, but only permitted suchaction to take effect on thedoor when the car was stopped. In my present invention my purpose is tomake the stopping or starting of the car automatically open or close thedoor without need" of any door-opening or doorclosing action by themotorman.

In the, accompanying drawing, A and B represent two magnets each ofwhichcon Such magdoor. An example of such an arrangement of magnets and dooropemmon 1S found :10 goes to the contact plates of the usual controller,so that the said controller as it iisfi in the United States; patent toThomas Farmer, Jr., No. 1,216,300, which is**se'-- 4o lected solely forthe purpose of illustration and without limiting the invention.

,automatically withoutaction' by the motor-v 't'em' has beendiagrammatically shown inthe drawing. Referring thereto K indicates thefeet of operating the controller is to close the Thus before thecontroller starts to regulate nectingl and 2 and directing theenergizing current of line 7 from 2 to the magnet A, or

will bear thereon along the dotted line 6,

thereby connecting 2 and 3 and directing the said current from 2tomagnetB, or, thirdly,

will bear thereon along dotted line-e, thereby connecting 1, 2 and 3 anddirecting the current from 2 to both'magnets A and B. Since the doors,in my plan,-are to open and close man, this selector swltch becomesnecessary and may be set by the motorman as described, or, mother ways,so as to director limit the' automatic action to the desired door '-orgroup of doors.

The invention may be placed in anystandard motor controlling thecircuit. For purposes of illustration and without intention of limitingthe invention thereto such a sysusual circuit closer of astandardtypemotor.

control, which is a part of practically all commercial equipment and isoperated to admit current'to the motor through thewire T leading fromthe usual trolley. It is also .to be understood that the back stop Gisalso connected to the same control. The first efswitc'h K, therebyadmitting current to the m otor,and opening theswitch P, therebybreaking theshort circuit around the resistanceQ, which is in serieswith the magnet E.

the speed of the car, the magnet E has the so resistance. Q, in serieswith it. The conductor inclosure of the resistance, and then cuts outthe resistance to. regulate the motors after they are in multiple. The,conductor'll leads on Lil from the controller to the motor, as isobvious from the drawing. 7

In operation the motorman, when he starts, first closes switch K andopens the switch P, as aforesaid. The closing of the switch K starts themotor and then by a further movement of the controller the speed of thecar is regulated.

While the car is running the counterelectromotive magnet E is energizedand thereby opens the circuit from the control through the lineGrleading to the door control at D.

At this time the doors cannot be manipulated.

as long as the motors are receiving current,

It is only after the motor controller has out off the motor from thetrolley that the mag-' net E receives current from the motorswhile theyare st1ll running by lnertia.

tive force magnet, because the electromotive force of the motors runningunder their own 'inertia supplies it withcurrent and this current: doesnot cease tov flowuntil the motor has come to a stop. l/Vhen the. motoractually has stopped, the. magnet E is de energized and its armature isaccordingly released, thereby establishing the control connection withthe door operating circuit 6. Thesa1d c1rcu1t-6 1s now energized and thedoors will open automatically without any other action by the motorman.Prior-to the present; invention, when the car was stopped the motormanhadto dosomething to causethedoors. to open, but by the presentinvention the stopping of the carautomatically causes the door to openwithout the intervention of the motorman. The switch marked; 3' is anemergency feature for use when the, trainv stops, in. a tunnel or someplace where the, doors should still remain closed; Forinstance, in thesubways now existing in many of the large cities a, train mayjbeheldupby signals between stations. Ordinarily as the train, comes to a stopunder the present invention the doors would automatically open. This,however, is undesirable under the circumstances and the switch R-isoperatedto render the, door controlling circuit ineffective. In otherwords, itis undesirable under normal conditions to open the doors whenthe train stops except theregular stationst ops. Solong as the switch Rremains. closed after the stopping of the car or, train it willautomatically open o the doors.

In-Ithe drawings the switchmarked D is shown with an irregular contourso as to provide a selective control over the number of doors which willbe operated automatically when the train comes to a stop. For instance,the doors on the side of'the caror train neXtto the station platform arethe only ones which are normally opened, those on-the other side of thecar or train remaining closed: Thewidest portioniof thesw-itch therebycaused to close. place without any action by the motorman,

D is designed to control all the doors on both sides and the otherportions are each so designed to control the doors only on one side orthe other.

E is a counter E. M. F. magnet connected by the wires 4 and 5 to therespective armature terminals of the propelling motor F, or by wires 4and 8 when the controller in its usual operation breaks wire 5 andconnects wire 8 to the trolley. Then the motor stops there is no currentin E and its armature drops back against a trolley-connected backstop G.The current then goes from said back-stop by wireso and 7. totheselector and thence to thevalvemagnet A and towhatever others may bealso connected to the selector. These valve magnets being energized willTherefore, the magnet E is calleda counte gelectromo the magnet E isenergized once more and acts to shut offthe current fromtheline 6,7'leading to the valve 'magnetsand the; doors are All of thistakesexcept to start and stop the car or train.

To insure the sett ng of selector switch D,

it may be interlocked with the usual removable controller handle in anysuitable way, whereby the said controller handlecan only be removed orreplaced when the selector switchjis properly set.

lVhatlZ claim as new-and; desire to secure by Letters Patent is: i "1.In car-door operation, a door-engine controller andmeans forautomatically work ing said controller to close and open'a door by'means'of a counter electromotive force magnet bridging the armatureterminals of the car propelling motor.

2. In car-door operation, a door engine, a 'rnagnet for controlling saidengine to cause the opening or closing of a door, a circuit closer forsaid magnet, and a counter electromotive force magnet, connected acrossthe terminals of the car-propellingmotor and acting automatically on thesaid'circuitcloser tocause theclosing of .the door'by the startingofsaid motor and-its opening by the stopr is fi ai met i- 3. In car-dooroperation, a controlling magnet for controlling door engines, a selectorswitch for directing current to .one or more ofjsaid controllingmagnets,a circuit closer vin a circuit leadingto said switch, and a counterelectrornotive force magnet for said circuit closer connected acrossthe. terminals of,the.car-propellingmotor and acting automatically onsaid;circuit-closer-to cause the closing-of the-selected door, or doorsby the starting offs aid motorand the opening thereof by. stopping ofsaidmotor.

4. In car-door operation, a controlling magnet.- for controlling-a doorengine, means whereby." said magnet, when, energized, vwill cause adoor-opening movement of the said engine and when (leenerglzed wlllcause a door-closing movement thereof, a circuitcloser in the circuit ofsaid magnet,.and a counter electromotive force magnet connected acrossthe terminals of the car-propelling motor and acting automatically onsaid circuit-closer to cause a door-closing movement of said engine onthe starting and a dooropening movement thereof on the stopping of saidmotor.

Signed at Albany, county of Albany, State of New York, this Qth day ofDecember,

, ERNEST MURPHY.

